Luminescence should be celebrated in the span between the third Sunday in February and second Sunday of March (whenever within that span is most convenient for your congregation).

It's important for a faith to celebrate holidays around the same time in order to give us a spiritual communion with all Unitarian Universalists around the world. There are a number of reasons why this time-frame was chosen: It is nearing the end of winter in our northern hemisphere, when we have been experiencing long nights and short days. This time of year is a time when a celebration is needed, when it's not being impinged upon too closely by too many other major holidays. We wanted to separate the celebration from the traditional Judeo-Christian holidays of December so that the many of us who also celebrate those holidays can celebrate them distinctly. The first few months of the year are a great time to still look back at the year that has just passed (part of the "reflection" process) and to resolve what to improve for the coming year. It's a time when we are first seeing the dawning of spring. Uplifting ritual sustains us at any time. We want to celebrate in communion with other UU's, if not in person, then is spirit.